What are the coordinates of the vertex of the graph of the function y = –x² + 6x –11?
(3, –2)
(3, 16)
(–3, –29)
(–3, –20)

Question

What are the coordinates of the vertex of the graph of the function y = –x² + 6x –11?  
(3, –2)
(3, 16)
(–3, –29)
(–3, –20)

zehanz · Answer

Hey @iloveyooh: this is your lucky day! The x-coordinate of the vertex is the same as the x-value of the line of symmetry (see your previous question),

So x=-b/(2a).
Calculate y by putting the x you found in the formula y=-x²+6x-11.

anonymous · Answer

could you write the problem out? because I don't understand how to put what you just said into a problem.

anonymous · Answer

@ZeHanz

anonymous · Answer

I NEED HELP!!!!!!!!!!

zehanz · Answer

Well, if x=-b/2a, and a=-1, b=6, I don't see what could be confusing about calculating this...